JP3681217B2 - Coloring film for bonding to glass - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a colored film to be applied to the inner surface of glass, particularly an automobile rear window glass.
[0002]
[Prior art]
Conventionally, colored glass is sometimes applied to the inner surface of a rear window glass of an automobile for the purpose of softening direct sunlight, improving the air-conditioning effect, preventing sunburn, and making it visible. However, when a film is pasted on a window glass, wrinkles are generated on the film to be used, and the film cannot be pasted neatly. Even if it can be pasted neatly, it took a long time, and efficient pasting was impossible.
[0003]
[Problems to be solved by the invention]
In the present invention, when a colored film is pasted on the inner surface of glass, particularly the rear window glass of an automobile, the generated wrinkles can be easily removed, and it has heat resistance, and the heat distribution in the thickness direction of the film is compared. It is to obtain a colored film that is uniform and can be operated quickly.
[0004]
[Means for Solving the Problems]
The present invention uses a release film made of a polyester film on the surface, a silicone heat-resistant release agent layer is formed on the release film, and an adhesive layer made of a heat-resistant acrylic resin is formed on the release agent layer. Adhesion that is bonded to the glass on which a pigment coating layer containing indium or antimony is provided adjacent to the pressure-sensitive adhesive layer, and then a hard coat layer composed of a heat-resistant acrylic resin layer is formed on the adjacent side through a polyester film It consists of a colored film.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As the colored film used in the present invention, the multilayer film shown in FIG. 1 is used.
As the film, for example, the following films or resins shown below are laminated in order from the upper surface to constitute a single multilayer film as a whole.
The film A used on the uppermost surface of the film shown in FIG. 1 is a release film made of a biaxially stretched polyester film, and the film has a thickness in the range of 35 μm to 50 μm. Then, a heat-resistant silicon release agent layer A ′ is formed on the release film. Therefore, when the release film A is pulled upward and peeled off, the release film A can be peeled upward together with the release agent layer A ′. The release agent used here must be heat-resistant.
[0006]
Next, an adhesive layer B is formed on the lower surface of the release agent layer A ′. As the pressure-sensitive adhesive layer B, a film made of a heat-resistant acrylic resin may be used. Moreover, if the thickness is about 15 to 25 μm in the sense of providing cushioning properties when applied, suitable cushioning properties can be obtained.
Next, a pigment coating layer C is provided under the pressure-sensitive adhesive layer B. By adding ultrafine particles such as indium, antimony and ceramics to the colored pigment of the pigment coating layer C, the thermal conductivity of the entire multilayer film can be improved and the moldability can be improved. it can.
[0007]
In this case, it is preferable to use tin-containing indium oxide as the indium and antimony-containing tin oxide in the form of ultrafine particles as the antimony. In that case, it was found that the mixing ratio of 30-50% with respect to the pigment was most effective for the content of indium and antimony.
Next, adjacent to the pigment coating layer C, the same polyester film D as the biaxially stretched polyester film used in the release film A is used with a thickness of 20 μ to 30 μ, preferably around 25 μm. I found out that
[0008]
Next, an acrylic resin film having heat resistance and good moldability is used as a hard coat layer E next to the biaxially stretched polyester film D in a thickness of about 10 μm to 20 μm. By adopting this film, it becomes easy to mold and has abrasion resistance, so that the film surface can be protected. As described above, the multilayer colored film of the present invention shown in FIG. 1 is a film composed of a composite layer which has heat resistance and wear resistance as a whole and is easily adapted to bending.
[0009]
When the film of the present invention having the above-described configuration is applied to the inner surface of the rear window glass of an automobile, the following steps are generally performed.
First, the window glass is wiped clean, then water is applied to the window glass with a mist spray to adhere the film to the glass. 1 is applied to the window glass, in which case the surface of the hard coat layer E is brought into contact with the outer surface of the rear window glass, and in this state, an adhesive tape or The film is partially fixed on the window glass with a sucker or the like.
[0010]
Next, the film in the stationary state is aligned with the window frame and the periphery thereof is cut. In this state, the film is in contact with the window glass with some wrinkles. Therefore, hot air at about 300 ° C. is blown toward the wrinkle generating part of the release film A located on the surface in order to adhere the film tightly to the window glass while heat shrinking. When the release film A is a polyester film, when hot air at around 300 ° C. is applied, the wrinkled portion exhibits plasticity and shrinks. In such a state, the film plasticized by a hand or a spatula in a state of wearing a glove while applying hot air is stretched outward in the peripheral direction. By doing so, the part of the ridges is stretched sequentially and the film adheres to the window glass.
[0011]
In this way, when the film wrinkles are completely removed and the film adheres firmly to the curved surface of the window, the film conforms to the curvature of the outer surface of the window glass and exhibits a shape that maintains its curvature. The shape is fixed with.
Thus, the entire film is peeled from the outside of the window glass while maintaining the shape of the outer surface of the window glass. At that time, the release film A is peeled from the pressure-sensitive adhesive layer B together with the release agent layer A ′. Accordingly, since the pressure-sensitive adhesive layer B becomes the outermost surface, the entire film is directly carried to the inside of the automobile, and the pressure-sensitive adhesive layer B facing the outer surface is adhered to the inner surface of the window glass.
[0012]
In this case, since the entire film has already maintained the curved shape of the rear window glass of the automobile, it can be easily matched with the inner curved glass that is the same as the outer side of the window glass. To adhere firmly to the glass, squeeze the film toward the outer periphery with gloves or a spatula while applying hot air to the hard coat layer from the inside. Thus, the film sticks to the window glass, the wrinkles are completely removed to show a clean surface, and the film is firmly adhered to the inner surface of the window glass by the adhesive layer to complete the adhesion of the colored film to the inner surface of the glass.
[0013]
【The invention's effect】
(1). By using the same biaxially stretched polyester film for the release film A and the polyester film D, the degree of squeezing and squeezing can be made the same overall, and the followability of the entire film can be improved.
Further, since a biaxially stretched polyester film is used as the release film A, it is strong against squeezing as described above.
(2). Since all the materials of each layer constituting the film have heat resistance, they can sufficiently withstand the hot air used when the film is attached to the window glass.
(3). Since the pigment coating layer contains indium and antimony in the pigment, it has good thermal conductivity, and the heat of the hot air applied to the release film can be evenly transmitted to all the layers of the film. Without conduction, the film as a whole can exhibit a thermally stable behavior.
(4). Since an acrylic heat-resistant resin film is used for the hard coat layer, the film surface is hardly damaged.
(5). Since the pressure-sensitive adhesive layer is made of a heat-resistant acrylic resin and has a thickness of 15 to 25 μm and relatively thick, cushioning properties can be imparted to the film.
(6). The film of the present invention is composed of a total of 6 layers, which are formed in the order described above, and each layer is formed of the material as described above, thereby achieving the intended purpose.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a colored film for bonding to be attached to a curved glass of the present invention.
[Explanation of symbols]
A Release film A 'Release agent layer B Adhesive layer C Pigment coating layer D Polyester film E Hard coat layer

Claims (1)

A release film made of a polyester film is used on the surface, a silicon-based heat-resistant release agent layer is formed on the release film, and a pressure-sensitive adhesive layer made of a heat-resistant acrylic resin is joined to the release agent layer. A colored film for adhesion to be applied to a glass in which a pigment coating layer containing indium or antimony is provided adjacent to the pressure-sensitive adhesive layer, and then a hard coat layer composed of a heat-resistant acrylic resin layer is formed next to the pigment coating layer.

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